Name: Fetching an Item by ID with a GraphQL DataLoader
Uploaded: 2021-12-01T00:01:52-06:00
Description: The DataLoader class is reusable and creating a new loader is as simple as changing the batch function

Detect Scaling Issues When Loading Data In a GraphQL API

Cache Database Requests Across GraphQL Resolvers

Batch Database Requests with a GraphQL API

Refactor the Data Loader into a Reusable Class

Create a New Cache on Every GraphQL Request Using Apollo Context

Install the DataLoader Package

Fetching an Item by ID with a GraphQL DataLoader

Fetching Many Items by Key with GraphQL DataLoaders

Count the Items in a Collection By Reusing a Data Loader

Count the Items in a Collection with a Custom Data Loader

Use GraphQL Data Loaders to Prevent Scaling Issues by Batching & Caching Database Requests

The DataLoader class is reusable and creating a new loader is as simple as changing the batch function

https://app.egghead.io/api/v1/lessons/apollo-fetching-an-item-by-id-with-a-graphql-dataloader/subtitles

Instructor: [0:00] Let's take advantage of the reusability of the DataLoader and clone our userLoader to make a postLoader. Make a PostResolver that takes an ID as an argument and calls postloader.load. Then to the schema, add post, ID string, returning a post.

[0:26] Try that new query out. Look at ID 2 here. We'll try to query that one specifically. Give ID 3 a shot, and everything is working wonderfully.

Fetching an Item by ID with a GraphQL DataLoader

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Use GraphQL Data Loaders to Prevent Scaling Issues by Batching & Caching Database Requests